Alright, firstly, please forgive my poor English. I'll try my best to explain all the issues clearly. from very above downto the third line are: IPv4 connection : not connected (Not OK, it wasn't like that) IPv6 connection : not connected (No public IPv6 connection in China, this is OK) Media State: connected But as you can see below, network is OK (Yeah, it seems that). The problem is, this ADSL connection is not showed in 'Avtive Networks'. Most online activities are OK, but somw applications like EA Origin are malfunctioned (I'm sure it is because of the problem in network connection) I've tried reset my winsock, LSP, netsh int ipv4,also reinstalled drivers. All above didn't help. you may wanna have a look at my Network and Share Center. Here it comes. Area 1 shows that there is no active networks except a 'unidentified network'(this refers to Local Area Conncetion. Since I don't neither have a router nor use LAN, that don't matter). When ADSL was OK, I got a active ADSL network there. So how can I deal with it?